Hamilton disston



TQSQDISSTON.

I GAGE. No.174,211. Patented Feb. 29, 1876.

NEPETERS, PHOTD-UTHOGRAPHER, WASHINGTON, n c.

being inline with each other.

PATENT OFFIo E. Y

.rHoM/is is. mama: on PHILADE PHIA, PENNSYLVANIA, ASSIGNOB or l armer" larsz nelil nf TQ HEN Y DI H M TQ ALBERTH. nrssro,1v,;on SAME PLACE. a

ff T MRRQVE ENT m. ve AGES.-

Specification formingpartoi' Letters Patent No. 174.21 1 dated February 29, 1-876 applicatipn filed February L4, 1876.

To all whom it may .aoztcemt;

Be it known that LTHQS S. DIssToN, of Philadelphia, Pennsylvania, have invented an Improved Measuring-Gage, of which the following is a specification:

in the accompanying drawing, Figurel is,

an exterior side view of my improved gage; Fig. 2, the'same as it appears after the removal of one side of the casing and one of the graduated plates; Fig. 3, a sectional view the reverse of thatgshownin Fig. 2, andFig. 4 a

transverse section. b l 4 The casing of the gage consists,'in the present instance, of'two plates, A and A,secured together by screws a a, and from one of these plates'projectthe two arms b and b, the former for the reception and guidance of a pin, B, and-the latter for receiving the set-screw or adjustable pin D, the said screw and pin g A lever, G, contained between the two plates A and A of the casing, is hung to a pin, d, and the short arme of this lever projectsinto a slot, 6, in the pin B, or is otherwise connected to the same. On the end of the long arm of the same lever is formed a toothed segment, f, which gears into a piniomh, on the circular plate H, both the latterand the'pinion being arranged to turn on a central pinyi, projecting from the plate A of the casing. A disk, I, is alsoar' ranged to turn with the plate H and pinion .on

the same pin. The said plate H is dished for the reception of a coiled spring, J, one end of which is attached to a pin, m, on the plate A of the casing, the other end being connected to the pin'non the plate H. The tendency of thisspring-isto turn the pinion hill the direction of the arrow, Fig. 2,and consequently tomaintain the pine incontact with the. end' of the screw ,D. ,Th'eouter face of the circular plate H has a circular scale, asshown in w Fig.3, and graduationsand figures of this scale canbe observed through the opening p A in the plate A of the casing, a part of the lattruth of which,

ter projecting in theform of a pointer, it, into the said opening.1-In like manner the graduationson the circular plate H can be observed through an opening, q, in the plate A of the f gears into, and is made to conform with,-a

diiferential pinion, h-a plan which is not essential, although I prefer it, because it insures a differential movement of the graduated disk and plate in respect to the movement of the pin B, and this enables me to mark on the scales a number of subdivisions for determining the gage of thin plates.

in using the instrument, the operator grasps the casing in his right hand, and, by applying his thumb to the plate 0, depresses thelong arm of the lever, thereby elevating the pin B. With his other hand he introduces a plate'or other object to be gaged between, the upper end of the set-screw or adjustable pin D and the pin B, and then releases the lever G, which, through the action of thespring J, depresses the said pin B, and brings it into contact with the plate, the exact thickness of which can be ascertained by an examination of the scale on either the plate H or disk I in connectio with the pointer.

For the convenient examination of one scale,

the instrument may 'be held in the position shown in Fig. 2; but for the purpose of examining the other scale the instrument should be reversed, when the arm a of the lever G will be below, and can be manipulatedby the forefinger instead of l the thumb.

Oneof the seriousobjections to the ordinary wire gage is the. wearing away of the metal on each side of each slot by the repeated invtroduction of the object to be gaged.p This N DI$STON, AND- difficulty is obviated in the abovedescribed worn, so as to render the instrument untrue,

the fact can be at once determined by the a pointer, which, when the pin and screw are in contact with each other, should always coincide with the zero-mark, (0), and if this examination detects any untruth it can be'easily rectified by the adjustment of the screw.

I claim as my inventiony 1. The combination, in a gaging instrument, of an adjustable screw or pin, D, a sliding pin, 13, a spring. tending to maintain the same in contact with the said adjustable pin D, and a graduated plate or plates, geared to and arranged to move simultaneously with the said sliding pin, all substantially as set forth.

2. The combination of the pin B, the lever G, its arm w, and toothed segment f, with the pinion h, connected to the graduated plate or plates.

3. The dilferential pinion on the graduated 

